勇气和愚蠢之间只有一线之隔。

There's ___a ___fine ___line between courage and foolishness.

我花了六个月才意识到，责骂和心理虐待之间只有一线之隔。

It took me 6 months to realize that there is ___a ___fine ___line between telling off and psychological abuse.

在艺术中，灵感和模仿之间往往只有一线之隔。

In art, there's often ___a ___fine ___line between inspiration and imitation.